 Glencross was small for his age, standing less than five feet tall when he was 15, and as a result was often left off the top teams in minor hockey despite having the talent to play; he played Midget C hockey in Provost.He experienced a rapid growth spurt, growing a full foot in a period of 17 months, and was recruited to play Junior A hockey for the expansion Brooks Bandits of the Alberta Junior Hockey League (AJHL) in 2000.He went on to become the first Bandit alumnus to play in the NHL, and his number 17 was retired by the team in 2011.